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sched: introduce avg_wakeup

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Introduce a new avg_wakeup statistic.

avg_wakeup is a measure of how frequently a task wakes up other tasks, it
represents the average time between wakeups, with a limit of avg_runtime
for when it doesn't wake up anybody.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-01-14 12:39:18 +01:00 committed by Ingo Molnar
parent a6525042bf
commit 831451ac4e
3 changed files with 34 additions and 6 deletions
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3
include/linux/sched.h
View file

@ -1046,6 +1046,9 @@ struct sched_entity {
u64 exec_max;
u64 slice_max;
u64 start_runtime;
u64 avg_wakeup;
u64 nr_migrations;
u64 nr_migrations_cold;
u64 nr_failed_migrations_affine;

30
kernel/sched.c
View file

@ -1705,6 +1705,9 @@ static void update_avg(u64 *avg, u64 sample)
static void enqueue_task(struct rq *rq, struct task_struct *p, int wakeup)
{
if (wakeup)
p->se.start_runtime = p->se.sum_exec_runtime;
sched_info_queued(p);
p->sched_class->enqueue_task(rq, p, wakeup);
p->se.on_rq = 1;
@ -1712,10 +1715,15 @@ static void enqueue_task(struct rq *rq, struct task_struct *p, int wakeup)
static void dequeue_task(struct rq *rq, struct task_struct *p, int sleep)
{
if (sleep && p->se.last_wakeup) {
if (sleep) {
if (p->se.last_wakeup) {
update_avg(&p->se.avg_overlap,
p->se.sum_exec_runtime - p->se.last_wakeup);
p->se.last_wakeup = 0;
} else {
update_avg(&p->se.avg_wakeup,
sysctl_sched_wakeup_granularity);
}
}
sched_info_dequeued(p);
@ -2345,6 +2353,22 @@ out_activate:
activate_task(rq, p, 1);
success = 1;
/*
* Only attribute actual wakeups done by this task.
*/
if (!in_interrupt()) {
struct sched_entity *se = &current->se;
u64 sample = se->sum_exec_runtime;
if (se->last_wakeup)
sample -= se->last_wakeup;
else
sample -= se->start_runtime;
update_avg(&se->avg_wakeup, sample);
se->last_wakeup = se->sum_exec_runtime;
}
out_running:
trace_sched_wakeup(rq, p, success);
check_preempt_curr(rq, p, sync);
@ -2355,8 +2379,6 @@ out_running:
p->sched_class->task_wake_up(rq, p);
#endif
out:
current->se.last_wakeup = current->se.sum_exec_runtime;
task_rq_unlock(rq, &flags);
return success;
@ -2386,6 +2408,8 @@ static void __sched_fork(struct task_struct *p)
p->se.prev_sum_exec_runtime = 0;
p->se.last_wakeup = 0;
p->se.avg_overlap = 0;
p->se.start_runtime = 0;
p->se.avg_wakeup = sysctl_sched_wakeup_granularity;
#ifdef CONFIG_SCHEDSTATS
p->se.wait_start = 0;

1
kernel/sched_debug.c
View file

@ -397,6 +397,7 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
PN(se.vruntime);
PN(se.sum_exec_runtime);
PN(se.avg_overlap);
PN(se.avg_wakeup);
nr_switches = p->nvcsw + p->nivcsw;